Several definitions:
1.Unit of weight
2.Money in England
3.To hit fists with your home dawgs
4.To have sex
5.To punch or beat someone up

Here's a little story:

One day, Bill wanted to pound his girlfriend, but she was a hoe and wanted 50 pounds to do it. Bill went to the hood and met Henry and pounded fists with him. His fist, may I add weighed about one pound. Bill asked Henry to lend him 50 pounds so he could pound his girlfriend or Bill would pound Henry and send him to the hospital. Henry gave Bill the 50 pounds.